I made one of these and used 1/4” all-thread with acorn nuts on the ends to made then safer and better looking. I couldn’t get the wire thing going right in my mind but all-thread is cheap so why not. I believe I used 3-36” sticks. I had a couple of 12 pieces left over when I finished. If I were doing it again I would probably change the ends of the pieces to something like this.

Thanks for posting the web sight so I could get a lay out and watch the video. I also liked the pop up stick chair in the video it was so amazing how it folds into a chair. I hope to make a stick chair soon . I will round off all the edges on mine with my router though. Yours looks nice.